Image forming method

Patent metadata

Field	Value
Publication number	US-11312865-B2
Application number	US-202017011694-A
Country	US
Kind code	B2
Filing date	Sep 3, 2020
Priority date	Sep 27, 2019
Publication date	Apr 26, 2022
Grant date	Apr 26, 2022

Abstract

An object of the present invention is to provide an image forming method capable of coating a photocurable varnish without unevenness on a toner image formed using an electrostatic latent image developing toner, and further having good adhesion between a varnish layer and the toner image. The image forming method of the present invention comprises: forming a toner image on a recording medium using an electrostatic latent image developing toner containing a toner particle comprising a binder resin and a release agent; and forming a varnish layer on the toner image by applying and curing a photocurable varnish comprising a photocurable compound. The binder resin comprised in the electrostatic latent image developing toner contains a crystalline polyester resin. The photocurable compound comprised in the photocurable varnish comprises a diol di(meth)acrylate having a straight hydrocarbon chain.

First claim

What is claimed is:

1. An image forming method comprising:
forming a toner image on a recording medium using an electrostatic latent image developing toner containing a toner particle comprising a binder resin and a release agent; and
forming a varnish layer on the toner image by applying and curing a photocurable varnish comprising a photocurable compound,
wherein the binder resin comprised in the electrostatic latent image developing toner contains a crystalline polyester resin, and
the photocurable compound comprised in the photocurable varnish comprises a diol di(meth)acrylate having a straight hydrocarbon chain.

2. The image forming method according to claim 1 , wherein a main chain of the crystalline polyester resin has a straight hydrocarbon chain,
wherein an absolute value of a difference between a number of carbon atoms of the straight hydrocarbon chain in the crystalline polyester resin and a number of carbon atoms of the straight hydrocarbon chain in the diol di(meth)acrylate is 8 or less.

3. The image forming method according to claim 1 , wherein a number of carbon atoms of the straight hydrocarbon chain in the diol di(meth)acrylate is 4 to 12.

4. The image forming method according to claim 1 , wherein the binder resin further comprises a vinyl-based resin,
wherein an amount of the vinyl-based resin relative to 100 parts by mass of a total amount of the binder resin is 50 parts by mass or more.

5. The image forming method according to claim 1 , wherein the binder resin further comprises an amorphous polyester resin.

6. The image forming method according to claim 1 , wherein the crystalline polyester resin partially includes a structure derived from an amorphous resin.

7. The image forming method according to claim 1 , wherein the release agent comprises an ester wax and a hydrocarbon wax.

8. The image forming method according to claim 7 , wherein a content mass ratio of the ester wax and the hydrocarbon wax is 5/95 to 95/5.

9. The image forming method according to claim 1 , wherein a surface tension of the photocurable varnish is 10 to 50 mN/m at 25° C., and
wherein a viscosity at 25° C. of the photocurable varnish measured with a vibrating viscometer 30 seconds after immersion of a vibrator to the photocurable varnish is 10 to 800 mPa·s.

Assignees

• Konica Minolta Inc

Inventors

• Kawamura Takaki
• Ueda Noboru
• Ito Natsuki
• Takigaura Yusuke
• Motohashi Ami

Classifications

• G03G9/08775

  Natural macromolecular compounds or derivatives thereof · CPC title

• C08F285/00

  Macromolecular compounds obtained by polymerising monomers on to preformed graft polymers · CPC title

• G03G8/00

  Layers covering the final reproduction, e.g. for protecting, for writing thereon · CPC title

• G03G9/08797

  characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature · CPC title

• C08F257/02

  on to polymers of styrene or alkyl-substituted styrenes · CPC title